Incrementing junit version

4.11 includes name parameter for @Parameters annotation
Provide much more extensive tests for ScopDatabase.

Added a new parametric ScopDatabaseTest, which can be extended
for each implementation to provide individual tests.

Many tests are sensitive to SCOP version, and may still need 
additional test cases for older versions.
Better testing for BerkeleyScopInstallation

Now runs the ScopDatabaseTest suite

Minor adjustment needed for 1.75B revisions
Fixing RemoteScopInstallation version
Adding RemoteScopInstallationTest

Many tests fail, but hopefully server updates will fix that
Added ScopDatabase node test
Handling empty XML responses in RemoteScopInstallation

Empty responses return null. This is consistent with how
null gets encoded as XML.